What is a Dyson Sphere?

About Dyson Sphere:

• It is a hypothetical engineering project that only highly advanced civilizations could build.
• These Dyson spheres would allow a civilization to harness all of a star's energy. 
• The prospect of such a construction was first proposed by physicist and astronomer Freeman J. Dyson back in 1960.
  • He envisioned them as a solar-system-sized shell consisting of a 'swarm of objects'' that could travel on independent orbits around a star, such as our sun.
  • The idea behind this is that the aliens commandeering this multi-faceted sphere would use it to harness the energy of the star to fulfil the energy needs of its technologically sophisticated people.
• Do Dyson spheres exist? 
  • Because of their infrared radiation, Dyson spheres are considered a type of technosignature—a sign of activity that distant astronomers could use to infer the existence of intelligent beings in the universe, according to a NASA report.
  • A handful of Earth-based researchers have scanned infrared maps of the night sky in hopes of spotting Dyson spheres, but so far, nobody has seen anything out of the ordinary.